2019 Mercedes E-Class Cabriolet vs. 2018 Audi S5

Detailed Review, Specifications & Comparison

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The E-Class Cabriolet’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The S5 doesn’t offer a driver alert monitor.

Both the E-Class Cabriolet and the S5 have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available all wheel drive, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.


There are over 26 percent more Mercedes dealers than there are Audi dealers, which makes it easier should you ever need service under the E-Class Cabriolet’s warranty.


J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that Mercedes vehicles are better in initial quality than Audi vehicles. J.D. Power ranks Mercedes 14th in initial quality, above the industry average. With 13 more problems per 100 vehicles, Audi is ranked 25th, below the industry average.


The E 450 Cabriolet’s standard 3.0 turbo V6 produces 8 more horsepower (362 vs. 354) than the S5’s 3.0 turbo V6. The AMG E 53 Cabriolet’s standard 3.0 turbo 6 cyl. hybrid produces 75 more horsepower (429 vs. 354) and 15 lbs.-ft. more torque (384 vs. 369) than the S5’s 3.0 turbo V6.

Fuel Economy and Range

The E-Class Cabriolet has 2.1 gallons more fuel capacity than the S5 (17.4 vs. 15.3 gallons), for longer range between fill-ups.


A nine-speed automatic is standard on the Mercedes E-Class Cabriolet, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the S5.

Brakes and Stopping

For better stopping power the E-Class Cabriolet’s brake rotors are larger than those on the S5:


E 450

AMG E 53


Front Rotors

14.2 inches

14.6 inches

13.8 inches

Rear Rotors

14.2 inches

14.2 inches

13 inches

Tires and Wheels

The E-Class Cabriolet’s optional 275/30R20 rear tires provide better handling because they have a lower 30 series profile (height to width ratio) that provides a stiffer sidewall than the S5’s optional 35 series tires.

For better ride, handling and brake cooling the E-Class Cabriolet offers optional 20-inch wheels. The S5’s largest wheels are only 19-inches.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the E-Class Cabriolet can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The S5 doesn’t offer run-flat tires.

Suspension and Handling

The E-Class Cabriolet has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The E-Class Cabriolet’s height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The S5 doesn’t offer a load leveling suspension.

The E-Class Cabriolet’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The S5 doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the E-Class Cabriolet’s wheelbase is 4.2 inches longer than on the S5 Cabriolet (113.1 inches vs. 108.9 inches).

For better handling and stability, the average track (width between the wheels) on the E-Class Cabriolet is 1.2 inches wider in the front and 1.4 inches wider in the rear than the track on the S5.

Cargo Capacity

The E-Class Cabriolet has a much larger trunk with its top down than the S5 Cabriolet with its top down (9.5 vs. 7.2 cubic feet).

To make loading and unloading groceries and cargo easier, especially for short adults, the E-Class Cabriolet offers an optional power trunk, which opens and closes automatically by pressing a button or just by kicking your foot under the back bumper, completely leaving your hands free. The S5 doesn’t offer a power trunk, so its trunk has to be closed manually.


The E-Class Cabriolet has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The S5 doesn’t offer a remote starting system.

Unlike the driver-only memory system in the S5, the E-Class Cabriolet has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The E-Class Cabriolet’s standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. The S5 doesn’t offer an easy entry system.

The E-Class Cabriolet’s standard power windows have a locking feature to keep children in the rear seat from operating them. Audi does not offer a locking feature on the S5’s standard power windows.

If the windows are left open on the E-Class Cabriolet the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the S5 can’t use the remote to operate the windows.

In case of a sudden change of weather, the E-Class Cabriolet has a standard remote convertible top that can be raised from a distance to protect the interior of the vehicle from damage. The S5 doesn’t offer a remote top, so the driver will have to run to the car, get in, turn the ignition on and raise the top to prevent the interior from being damaged.

To help drivers avoid possible obstacles, the E-Class Cabriolet has standard cornering lights to illuminate around corners when the turn signals are activated. The S5 doesn’t offer cornering lights. The E-Class Cabriolet also offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle.

The E-Class Cabriolet’s optional Active Parking Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The S5 doesn’t offer an automated parking system.

Model Availability

The Mercedes E-Class comes in coupe, convertible, sedan and station wagon bodystyles; the Audi S5 isn’t available as a station wagon.

The E-Class Cabriolet is available in both rear-wheel drive and all-wheel drive configurations. The S5 doesn’t offer a two-wheel drive configuration.

Economic Advantages

Insurance will cost less for the E-Class Cabriolet owner. The Complete Car Cost Guide estimates that insurance for the E-Class Cabriolet will cost $1210 to $2945 less than the S5 over a five-year period.


The E-Class was chosen as one of Car and Driver’s “Top Ten” in 2018. The S5 has never been a Car and Driver “Top Ten” pick.

The Mercedes E-Class outsold the Audi A5/S5/RS 5 by 60% during the 2018 model year.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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